JP2003001992A - Cap fitting structure for writing instrument - Google Patents
Cap fitting structure for writing instrumentInfo
- Publication number
- JP2003001992A JP2003001992A JP2001192188A JP2001192188A JP2003001992A JP 2003001992 A JP2003001992 A JP 2003001992A JP 2001192188 A JP2001192188 A JP 2001192188A JP 2001192188 A JP2001192188 A JP 2001192188A JP 2003001992 A JP2003001992 A JP 2003001992A
- Authority
- JP
- Japan
- Prior art keywords
- cap
- fitting
- locking projection
- writing instrument
- inward
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Pens And Brushes (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、合成樹脂で成形さ
れた筆記具のキャップ嵌合構造に関するものである。
【０００２】
【従来の技術】筆記具本体に合成樹脂製のキャップを嵌
合する構造は、筆記具本体の嵌合部の外周面に環状の外
向き係止突起を形成し、キャップの嵌合筒部の内周面に
も内向き係止突起を形成し、内向き係止突起が外向き係
止突起を乗り越えることによってキャップが筆記具本体
に嵌合されるものが多い。ここで、内向き係止突起が外
向き係止突起を乗り越えるときのフィーリンクが重要で
あり、適度の押圧力で内向き係止突起が外向き係止突起
を乗り越える必要があり、この押圧力は長期間使用して
も変化しないことが要求される。
【０００３】
【発明が解決しようとする課題】かかる筆記具のキャッ
プ嵌合構造において、キャップの内向き係止突起が筆記
具本体の外向き係止突起を乗り越えてキャップ嵌合が完
了するときには、内向き係止突起は筆記具本体の嵌合部
の外周面に当接するように設計されている。これは、例
えばサインペンのように、キャップの嵌合部の気密性に
よりインキの蒸発を防止する必要がある筆記具の場合
は、内向き係止突起を筆記具本体の嵌合部の外周面に当
接させることにより気密性を向上させるためであり、キ
ャップの嵌合部におけるインキの蒸発防止があまり必要
のない筆記具の場合であっても、嵌合時のキャップの
「がたつき」を少なくするために内向き係止突起を筆記
具本体の嵌合部の外周面に当接させている。
【０００４】しかし、合成樹脂製キャップの嵌合筒部に
形成された内向き係止突起を筆記具本体の嵌合部の外周
面に当接させると、キャップの嵌合筒部に常時応力がか
かるが、キャップの嵌合筒部は合成樹脂の応力緩和現象
により嵌合筒部の内径が徐々に拡大する。このため、キ
ャップ嵌合時に要求される押圧力が徐々に少なくなり、
長期間使用していると、キャップ嵌合のフィーリングが
変化してしまう不具合がある。
【０００５】そこで本発明は、長期間使用してもキャッ
プ嵌合時のフィーリングが変化しない合成製樹脂製の筆
記具のキャップ嵌合構造を提供することを目的とするも
のである。
【０００６】
【課題を解決するための手段】かかる目的を達成するた
めに、本発明は、筆記具本体の嵌合部の外周面に環状の
外向き係止突起が形成され、合成樹脂製キャップの嵌合
筒部の内周面に内向き係止突起が形成され、キャップの
内向き係止突起が筆記具本体の外向き係止突起を乗り越
えてキャップが嵌合される筆記具のキャップ嵌合構造に
おいて、内向き係止突起が外向き係止突起を乗り越えて
キャップ嵌合が完了した際に、内向き係止突起が筆記具
本体の嵌合部に当接しないようにする。
【０００７】
【発明の実施の形態】以下に、図面に基づいて本発明の
実施の形態を具体的に説明する。図１はボールペンに本
発明を適用した例を示す。図１において、軸筒１０の先
端に先口１４が螺着されており、軸筒１０と先口１４な
どで筆記具本体を構成している。軸筒１０の筆記時に指
先が当接する部分には軟弾性体からなるグリップ１３が
嵌め込まれている。軸筒１０内にはボールペンレフィー
ル（図示せず）が内蔵されており、ボールペンレフィー
ル先端のボールペン体１５が先口１４の先端開口から突
出している。
【０００８】合成樹脂、例えばポリカーボネートで略円
筒状に成形されたキャップ本体２０の内部中腹に嵌合筒
部２１が２重筒状態に一体に成形されている。なお、嵌
合筒部２１とは、後述する内向き係止突起２２が形成さ
れる部分のことであり、図例のように必ずしも２重筒に
なっている必要はない。クリップ２６が一体になった頭
冠２５がキャップ本体２０の尾端開口に嵌着され、キャ
ップ本体２０と頭冠２５でキャップを構成している。キ
ャップ本体２０の奥底部には、軟弾性体からなる球状の
シール体２７が配置されており、キャップを筆記具本体
に嵌着したときにボールペン体１５がシール体２７で覆
われてインキの蒸発を防止するようになっている。
【０００９】軸筒１０の先端部はやや小径の嵌合部１１
であり、図２に示すように、この嵌合部１１の外周面に
は、円環状であって、表面形状が円弧状の外向き係止突
起１２が形成されている。一方、キャップ本体２０の嵌
合筒部２１の内周面には、同じく円環状であって、表面
形状が緩やかな円弧状をした内向き係止突起２２が形成
されている。
【００１０】しかして、筆記具本体をキャップ本体２０
内に差し込むと、内向き係止突起２２が外向き係止突起
１２を乗り越えて内向き係止突起２２と外向き係止突起
１２が係合し、嵌合筒部２１の先端２１ａが軸筒１０の
段部１０ａに当接してキャップ嵌合が完了する。このと
き、内向き係止突起２２は軸筒１０の嵌合部１１には当
接していない。従って、嵌合筒部２１を外側に押し広げ
る応力が小さく、長期間使用しても、嵌合筒部２１を構
成する合成樹脂の応力緩和現象が生じにくく、嵌合筒部
２１の内径が拡大することがほとんどない。このため、
長期間使用しても、一定の押圧力でキャップ嵌合が可能
であり、キャップ嵌合時のフィーリングが変化しない。
このよう本発明は、内向き係止突起２２は軸筒１０の嵌
合部１１には当接していないので、キャップの嵌合部に
おける気密性は幾分劣るが、先端シール式のボールペン
のように、キャップの嵌合部におけるインキの蒸発防止
があまり必要のない筆記具に好適である。
【００１１】
【発明の効果】以上説明したように、本発明は、筆記具
本体の嵌合部の外周面に環状の外向き係止突起が形成さ
れ、合成樹脂製キャップの嵌合筒部の内周面に内向き係
止突起が形成され、キャップの内向き係止突起が筆記具
本体の外向き係止突起を乗り越えてキャップが嵌合され
る筆記具のキャップ嵌合構造において、内向き係止突起
が外向き係止突起を乗り越えてキャップ嵌合が完了した
際に、内向き係止突起が筆記具本体の嵌合部に当接しな
いので、長期間使用してもキャップ嵌合時のフィーリン
グが変化しない合成製樹脂製の筆記具のキャップ嵌合構
造とすることができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument cap fitting structure made of synthetic resin. 2. Description of the Related Art In a structure in which a synthetic resin cap is fitted to a writing instrument main body, an annular outward locking projection is formed on an outer peripheral surface of a fitting portion of the writing instrument main body, and a fitting cylindrical portion of the cap is formed. In many cases, an inward locking projection is also formed on the inner peripheral surface of the writing tool, and the cap is fitted to the writing implement body by the inward locking projection riding over the outward locking projection. Here, the feeling link when the inward locking projection gets over the outward locking projection is important, and it is necessary for the inward locking projection to get over the outward locking projection with an appropriate pressing force. Is required not to change even after long-term use. [0003] In such a writing instrument cap fitting structure, when the inward locking projection of the cap rides over the outward locking projection of the writing instrument body and the cap fitting is completed, the inward locking projection is turned inward. The locking projection is designed to contact the outer peripheral surface of the fitting portion of the writing instrument body. This is because, for example, in the case of a writing instrument, such as a felt-tip pen, which needs to prevent evaporation of ink due to the airtightness of the fitting section of the cap, the inward locking projection abuts on the outer peripheral surface of the fitting section of the writing instrument body. In order to reduce airtightness of the cap at the time of fitting, even in the case of a writing instrument that does not require much prevention of ink evaporation at the fitting portion of the cap, it is for improving the airtightness. The inward locking projection is brought into contact with the outer peripheral surface of the fitting portion of the writing instrument body. However, when the inward locking projection formed on the fitting cylindrical portion of the synthetic resin cap is brought into contact with the outer peripheral surface of the fitting portion of the writing instrument body, stress is always applied to the fitting cylindrical portion of the cap. However, the inner diameter of the fitting cylindrical portion of the cap gradually increases due to the stress relaxation phenomenon of the synthetic resin. For this reason, the pressing force required at the time of cap fitting gradually decreases,
If used for a long time, there is a problem that the feeling of fitting the cap changes. Accordingly, an object of the present invention is to provide a cap fitting structure for a writing tool made of synthetic resin which does not change the feeling when the cap is fitted even after long-term use. In order to achieve the above object, the present invention provides a writing instrument main body in which an annular outward locking projection is formed on the outer peripheral surface of a fitting portion, and a synthetic resin cap is provided. An inward locking projection is formed on the inner peripheral surface of the fitting cylindrical portion, and the inward locking projection of the cap rides over the outward locking projection of the writing instrument body, and the cap is fitted into the cap fitting structure of the writing implement. When the cap engagement is completed after the inward locking projection gets over the outward locking projection, the inward locking projection is prevented from abutting on the fitting portion of the writing instrument body. Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows an example in which the present invention is applied to a ballpoint pen. In FIG. 1, a tip 14 is screwed to the tip of the barrel 10, and the writing barrel main body is constituted by the barrel 10 and the tip 14. A grip 13 made of a soft elastic body is fitted into a portion of the shaft cylinder 10 at which a fingertip comes into contact during writing. A ballpoint pen refill (not shown) is built in the barrel 10, and a ballpoint pen body 15 at the tip of the ballpoint pen refill projects from the front end opening of the front opening 14. A fitting cylindrical portion 21 is integrally formed in a double cylindrical state on the inside middle of a cap body 20 formed of a synthetic resin, for example, a polycarbonate, into a substantially cylindrical shape. Note that the fitting cylinder portion 21 is a portion where an inward locking projection 22 described later is formed, and does not necessarily have to be a double cylinder as in the illustrated example. A cap 25 with the integrated clip 26 is fitted into the tail end opening of the cap body 20, and the cap body 20 and the cap 25 constitute a cap. A spherical seal 27 made of a soft elastic body is disposed at the bottom of the cap main body 20. When the cap is fitted to the writing instrument main body, the ball-point pen body 15 is covered with the seal 27 and evaporates ink. To prevent it. The distal end of the shaft cylinder 10 has a slightly smaller fitting portion 11.
As shown in FIG. 2, on the outer peripheral surface of the fitting portion 11, an outward locking projection 12 having an annular surface shape and an arc shape is formed. On the other hand, on the inner peripheral surface of the fitting cylindrical portion 21 of the cap body 20, an inward locking projection 22 which is also annular and has a gentle arc shape is formed. [0010] Thus, the writing instrument main body is moved to the cap main body 20.
When inserted inward, the inward locking projection 22 rides over the outward locking projection 12 and the inward locking projection 22 and the outward locking projection 12 are engaged with each other. The cap fitting is completed by contacting the step 10a of the cap 10. At this time, the inward locking projection 22 is not in contact with the fitting portion 11 of the barrel 10. Therefore, the stress that pushes the fitting cylinder 21 outward is small, and even when used for a long time, the stress relaxation phenomenon of the synthetic resin constituting the fitting cylinder 21 is unlikely to occur, and the inner diameter of the fitting cylinder 21 increases. Hardly ever. For this reason,
Even when used for a long time, the cap can be fitted with a constant pressing force, and the feeling when the cap is fitted does not change.
As described above, in the present invention, since the inward locking projection 22 does not abut on the fitting portion 11 of the barrel 10, the airtightness at the fitting portion of the cap is somewhat inferior. In addition, the present invention is suitable for a writing instrument that does not require much prevention of evaporation of ink at the fitting portion of the cap. As described above, according to the present invention, a ring-shaped outward locking projection is formed on the outer peripheral surface of the fitting portion of the writing instrument main body, and the inside of the fitting cylindrical portion of the synthetic resin cap is formed. An inward locking projection is formed on the peripheral surface, and the inward locking projection of the cap rides over the outward locking projection of the writing instrument main body to fit the cap. When the cap has been fitted over the outward locking projection, the inward locking projection does not come into contact with the fitting part of the writing instrument body. A cap fitting structure of a writing instrument made of synthetic resin which does not change can be provided.
【図面の簡単な説明】 【図１】本発明実施例の説明図である。 【図２】図１Ａ部の拡大図である。 【符号の説明】 １０ 軸筒 １１ 嵌合部 １２ 外向き係止突起 １３ グリップ １４ 口金 １５ ボールペン体 ２０ キャップ本体 ２１ 係合筒部 ２２ 内向き係止突起 ２５ 頭冠 ２６ クリップ ２７ シール体[Brief description of the drawings] FIG. 1 is an explanatory diagram of an embodiment of the present invention. FIG. 2 is an enlarged view of a portion of FIG. 1A. [Explanation of symbols] 10 shaft barrel 11 Fitting part 12 outward locking projection 13 grips 14 base 15 Ballpoint pen body 20 cap body 21 Engagement tube 22 Inward locking projection 25 cap 26 clips 27 Seal body
Claims (1)
向き係止突起が形成され、合成樹脂製キャップの嵌合筒
部の内周面に内向き係止突起が形成され、該内向き係止
突起が該外向き係止突起を乗り越えてキャップが嵌合さ
れる筆記具のキャップ嵌合構造において、 前記内向き係止突起が該外向き係止突起を乗り越えてキ
ャップ嵌合が完了した際に、該内向き係止突起は該筆記
具本体の嵌合部に当接しないことを特徴とする筆記具の
キャップ嵌合構造。Claims: 1. An annular outward locking projection is formed on an outer peripheral surface of a fitting portion of a writing instrument main body, and is inwardly locked on an inner peripheral surface of a fitting cylindrical portion of a synthetic resin cap. In a cap fitting structure of a writing instrument, wherein a projection is formed, and the inward locking projection rides over the outward locking projection and a cap is fitted, the inward locking projection rides over the outward locking projection. The cap fitting structure for a writing instrument, wherein when the cap fitting is completed, the inward locking projection does not come into contact with the fitting portion of the writing instrument body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001192188A JP3859992B2 (en) | 2001-06-26 | 2001-06-26 | Writing instrument cap mating structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001192188A JP3859992B2 (en) | 2001-06-26 | 2001-06-26 | Writing instrument cap mating structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003001992A true JP2003001992A (en) | 2003-01-08 |
| JP3859992B2 JP3859992B2 (en) | 2006-12-20 |
Family
ID=19030678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001192188A Expired - Fee Related JP3859992B2 (en) | 2001-06-26 | 2001-06-26 | Writing instrument cap mating structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3859992B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019014192A (en) * | 2017-07-10 | 2019-01-31 | 三菱鉛筆株式会社 | Writing instrument |
-
2001
- 2001-06-26 JP JP2001192188A patent/JP3859992B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019014192A (en) * | 2017-07-10 | 2019-01-31 | 三菱鉛筆株式会社 | Writing instrument |
| JP7023060B2 (en) | 2017-07-10 | 2022-02-21 | 三菱鉛筆株式会社 | Stationery |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3859992B2 (en) | 2006-12-20 |
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